string = "他问,你知道cba是什么单词的缩写么  ?   "
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option = input("请输入功能选项: \n")
    if option=='1':
        string = string.replace(' ','')
        print(string)
    elif option == '2':
        #替换英文标点符号
        for i in string:
            if i == ',':
                 string = string.replace(',','，')
            elif i == '.':
                 string = string.replace('.','。')
            elif i == '?':
                 string = string.replace('?','？')
            elif i == '?':
                 string = string.replace("'","’")
        string = string
        print(string)
             
    elif option =='3':
            #首字母大写
            string = string.upper()
            print(string)
    elif option == '4':
        break